Our Planing Boats – Deadrise Explained

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Deadrise Explained

A boats deadrise is defined by the angle formed between between the horizontal plane and the vessels hull. This is usually given by most manufacturers as an angle at the transom. To give you an example of this is shown in the transom section in the images below.

The angle is seen as essentially how much of a vee shape the hull makes. It is a shape that is most carefully engineered to achieve a certain result. Therefore this should be important to you, if you are after a vessel that can handle rough water, or shallow water. Whether you’re looking for overall smooth ride or high performance.

At CNC Marine

At CNC Marine most of our vessels use a variable deadrise which starts at about 15 degrees at the transom but aggressively increases towards the bow. We’ve spent a large amount of time and used leading edge naval architecture software to come up with a hull that meets our stringent requirements. We aimed to achieve a fine waterline entry while retaining stability and efficiency. We did this while also creating a structure that is easy to put together and does not require any jigs.

Our Answer to ‘What Deadrise do Your Vessels Have?’

It’s often hard to give an accurate answer when somebody asks us what deadrise each vessel has. Our answers are much like what is illustrated in the images below. These images show the varying deadrise of our 7500CC. As you can see at the transom it is 16 degrees and slowly changes through to the midships, this allows for a stable boat at rest. Continuing towards the bow the deadrise increases drastically. When we get to the entry point of this vessel you can see this increases to 52 degrees, allowing for a sharp crisp entry into swell.